cp's OEIS Frontend

A209590 Number of n X n 0..5 arrays with every element equal to a diagonal or antidiagonal reflection.

%I A209590 #8 Jul 22 2025 21:50:18
%S A209590 6,1296,513216,7316407296,191221621088256,179919658395455717376,
%T A209590 310357092660359621536382976,19272907305680273946696375374708736,
%U A209590 2194189968466526991277450769351996054962176
%N A209590 Number of n X n 0..5 arrays with every element equal to a diagonal or antidiagonal reflection.
%C A209590 Column 5 of A209593
%H A209590 R. H. Hardin, <a href="/A209590/b209590.txt">Table of n, a(n) for n = 1..30</a>
%F A209590 a(n) = 6 ^ (2*n-(n modulo 2)) * 66 ^ ((n*n-2*n+(n modulo 2))/4)
%e A209590 Some solutions for n=3
%e A209590 ..0..5..4....0..2..3....3..2..3....0..4..1....0..3..2....0..0..3....0..0..2
%e A209590 ..5..4..1....2..0..0....5..5..2....4..1..3....5..2..3....5..1..0....3..5..0
%e A209590 ..2..1..5....3..0..1....2..5..0....3..3..5....4..5..1....5..5..5....4..3..3
%K A209590 nonn
%O A209590 1,1
%A A209590 _R. H. Hardin_ Mar 10 2012